Show desktop client F9 does not start app

I have downloaded My First App in Business Modeler 5.0.0. Deployed Locally. No errors. When I click Show desktop client it opens my browser and shows http://localhost:8080/index.html. Nothing happens. I'm completely new to mendix and have tried to search for a solution myself but could not find it. Thanks for the help
1 answers

That is odd. Any chance you have other software running on port 8080? Or the admin port at 8090? Though normally you'd get a warning for that. Perhaps you could change the port just to make sure? If you ran a Mendix 4 version of the client at some point, try clearing your browser cache (ctrl-shift-delete in most browsers)